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    User name V. Sulkosky

    Log entry time 19:17:31 on February 17, 2009

    Entry number 261692

    keyword=Reference Pressure Gauge Readings

    There appears to be an offset of -12 to -13 psig on the high pressure
    gauge, when the reference cell is under vacuum. This offset appears to be
    constant compared the low pressure gauge:

    Vacuum Gauge (Torr)      High Pressure Gauge (psig)
    ++++++++++++++++++++++++++++++++++++++++++++++++++++++
    -8                              -27 to -28
    762                             -12 to -13
    903                                 -9
    
    This is a fairly large offset considering that the gauge was calibrated
    right before the start of d2n. There was some concern that this might
    not be a simple offset, but there could also be a scale difference
    involved. It was decided to take the nitrogen reference cell runs
    at 20 psig (actually 8 psig reading back on the gauge).

    Perhaps during the next day access, Scot can take a look at the gauge.

    A copy of this log entry has been emailed to: brads,jpchen,yqiang,spiegel